Bathtub



FIG. 1 is a perspective view taken from the front and top of a bathtub showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevational view thereof, with the skirt being omitted for convenience of illustration; and

FIG. 4 is a perspective view taken from the top and rear of FIG. 3. 

The ornamental design for a bathtub, as shown. 